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Renesas QS3VH257QG8
- Part No.:
- QS3VH257QG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH257QG8.pdf
- Description:
- IC BUS SWITCH 4 X 2:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
QS3VH257QG8 from Renesas Electronics (formerly IDT) is a 2.5V/3.3V quad 2:1 multiplexer/demultiplexer bus switch with 4Ω typical ON resistance, <0.2 ns propagation delay, and 5V-tolerant I/Os. It operates from –40°C to +85°C and supports rail-to-rail analog switching (0–5V) in hot-swap and high-speed communication interfaces.
For engineers reviewing the QS3VH257QG8 datasheet, QS3VH257QG8 pinout, QS3VH257QG8 application, or QS3VH257QG8 equivalent, key selection criteria include its LVTTL-compatible control inputs, 500MHz bandwidth, bidirectional zero-delay signal path, high OFF-state impedance (>1 GΩ), and undershoot clamp diodes on all switch/control pins.
Technical Context
The QS3VH257QG8 implements four independent N-channel FET switches without parasitic diodes to VCC, enabling true isolation under power-off conditions and eliminating DC paths to VCC or GND. Each channel supports bidirectional signal flow with flat RON over voltage and temperature, and tolerates up to 5.5V on switch terminals regardless of VCC state.
Control logic uses active-low Enable (E) and single-bit Select (S) to route between I0x/I1x inputs and Yx outputs. Switching is governed by CMOS-compatible thresholds (VIH = 2.0V min at VCC ≥ 2.7V; VIL = 0.8V max), and dynamic operation is validated up to 20 MHz toggle frequency on E or S inputs with no load capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports dual-supply systems using either 2.5V or 3.3V logic rails |
| RON (Typ) | 4Ω at VCC = 3.0V, VIN = 0V - ensures minimal signal attenuation and distortion in analog/digital buses |
| Propagation Delay | <0.2 ns - contributes negligible timing skew in high-speed parallel data paths |
| I/O Voltage Tolerance | –0.5V to +5.5V - enables safe interfacing with 5V legacy peripherals while powered from 3.3V |
| Bandwidth | Up to 500MHz - supports DDR, PCI Express Gen1, and other high-frequency digital protocols |
| OFF-State Impedance | >1 GΩ - provides strong channel isolation for signal integrity in multiplexed backplanes |
| Input Capacitance | 4 pF typical (control), 4–6 pF (switch OFF) - minimizes loading on driving sources and preserves edge rates |
Pinout & Package
QS3VH257QG8 is packaged in a 16-pin QSOP (Green) with 0.65 mm pitch, body width 3.9 mm, and JEDEC MO-137AC compliance. Pinout matches industry-standard quad 2:1 mux layout for drop-in compatibility across IDT/Renesas QuickSwitch family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I0A–I0D | Data Input (Channel 0) | First input pair per channel; routed to Yx when S = L and E = L |
| I1A–I1D | Data Input (Channel 1) | Second input pair per channel; routed to Yx when S = H and E = L |
| YA–YD | Data Output | Bidirectional output node; passes signal from selected Ixx with near-zero delay |
| S | Select Control | LVTTL-compatible input determining I0x vs I1x routing; no internal pull-up/down |
| E | Enable Control | Active-low enable; all channels enter high-impedance state when E = H |
| VCC | Supply Rail | Power for control logic and gate drive; decoupling required within 1 cm of pin |
| GND | Reference Plane | Signal and power return; must be low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET architecture with no parasitic diode to VCC | Enables true power-off isolation and prevents back-powering of upstream circuitry |
| Rail-to-rail analog switching (0–5V) | Supports mixed-voltage systems without level shifters or clamping networks |
| Undershoot clamp diodes on all I/O and control pins | Protects against –3V transient spikes during hot-plug events without external components |
| Flat RON vs VIN characteristic | Maintains consistent signal integrity across full input swing, critical for video and RF sampling paths |
| Excellent RON matching between channels (<1Ω mismatch) | Reduces crosstalk-induced timing skew in parallel data buses and differential pairs |
Applications
| Hot-Swappable Backplane Interface | High-Speed Memory Multiplexing |
|---|---|
Use Scenario: Insertion/removal of line cards in telecom chassis without powering down the system. IC Role / Device Role / Timing Role: Bidirectional signal pass-through switch isolating card-side logic from backplane during insertion. Use Value: Prevents bus contention and ground bounce via 5V-tolerant I/Os and sub-0.2ns delay, enabling zero-downtime maintenance. | Use Scenario: Sharing a single memory controller between two banks of SDRAM or Flash in space-constrained embedded systems. IC Role / Device Role / Timing Role: Quad 2:1 mux dynamically selecting between memory banks under software control. Use Value: Eliminates need for dual controllers; 4Ω RON and 500MHz bandwidth preserve setup/hold timing margins. |
| Low-Distortion Analog Signal Routing | ATM Cell Switching Interface |
Use Scenario: Routing audio, video, or sensor signals in test equipment where signal fidelity must be preserved. IC Role / Device Role / Timing Role: Low-capacitance (4pF), low-RON analog switch replacing mechanical relays in automated test fixtures. Use Value: Delivers <0.01% THD+N due to flat RON and rail-to-rail operation, avoiding clipping or DC offset. | Use Scenario: Interfacing ATM 25/155 PHY layers to shared framer or SAR engines in access concentrators. IC Role / Device Role / Timing Role: High-bandwidth demux routing incoming cells to parallel processing paths based on VPI/VCI headers. Use Value: 20 MHz max toggle rate on E/S inputs meets cell-rate timing requirements; 5V tolerance handles legacy PHY signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 analog/digital bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3257PW | Higher RON (7Ω typ), no undershoot clamps, VCC = 4.5–5.5V only | Requires 5V supply; unsuitable for 2.5V systems or hot-swap transients | Choose only if operating strictly at 5V with no transient immunity requirement |
| PI3CH400QE | Lower bandwidth (300MHz), no 5V tolerance on I/Os, different pinout (SOIC-16) | Not suitable for 5V legacy interface bridging or high-frequency DDR paths | Consider only for cost-sensitive 3.3V-only designs where bandwidth ≤300MHz suffices |
Compared with SN74CBT3257PW and PI3CH400QE, the QS3VH257QG8 uniquely combines 2.5V/3.3V operation, 5V I/O tolerance, undershoot protection, and 500MHz bandwidth-making it the only option qualified for industrial hot-swap and mixed-voltage telecom infrastructure.
Availability
QS3VH257QG8 is available at Aetrix Electronics and suitable for hot-swappable backplane interfaces, high-speed memory multiplexing, low-distortion analog routing, and ATM cell switching applications requiring stable component supply across extended temperature ranges.
Supply support for QS3VH257QG8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The QS3VH257QG8 belongs to Renesas' QuickSwitch® bus switch product line, engineered specifically for high-bandwidth, low-latency signal routing in live-insertion and mixed-voltage systems.
FAQ
What is the maximum allowable voltage on the I/O pins of the QS3VH257QG8 when VCC = 0V?
The QS3VH257QG8 allows –0.5V to +5.5V on all switch and control pins (I0A–I1D, YA–YD, S, E) regardless of VCC state. This 5V tolerance enables safe hot-plug operation and interoperability with 5V peripherals even when the device is unpowered, a key feature confirmed in the Absolute Maximum Ratings table.
Does the QS3VH257QG8 require external pull-up or pull-down resistors on its control inputs?
No, the QS3VH257QG8 does not require external pull-up or pull-down resistors on S or E inputs. Its LVTTL-compatible control thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC ≥ 2.7V) are designed to interface directly with standard logic drivers. Internal weak pull-downs are not present, so external biasing is needed only if floating states must be avoided in system-level design.
Can the QS3VH257QG8 be used to switch analog signals such as audio or video?
Yes, the QS3VH257QG8 is explicitly qualified for low-distortion analog signal routing. Its rail-to-rail capability (0–5V), flat RON vs VIN curve, 4pF I/O capacitance, and absence of parasitic diodes ensure minimal THD+N and signal degradation-making it suitable for audio multiplexing, video path selection, and sensor signal conditioning in industrial test equipment.
What is the thermal operating range for the QS3VH257QG8?
The QS3VH257QG8 is characterized for continuous operation from –40°C to +85°C, meeting industrial temperature grade requirements. This range is verified across all electrical parameters including RON, propagation delay, and leakage current, ensuring reliable performance in base stations, factory automation controllers, and outdoor networking gear.
Is the QS3VH257QG8 pin-compatible with other devices in the IDT QuickSwitch family?
Yes, the QS3VH257QG8 shares identical pinout and function mapping with other 16-pin QSOP variants in the QS3VHxxx series, including QS3VH244, QS3VH245, and QS3VH251. This enables direct substitution within the same package footprint for design reuse, provided voltage, bandwidth, and channel count requirements align.
QS3VH257QG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
QS3VH257QG8 FAQ
1.How can I place an order for QS3VH257QG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH257QG8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for QS3VH257QG8 reliable?
The price and inventory of QS3VH257QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH257QG8 is usually 5 days.
3.What payment methods are accepted for QS3VH257QG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH257QG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH257QG8?
QS3VH257QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH257QG8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for QS3VH257QG8?
For technical support, including QS3VH257QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH257QG8 requirements.
6.How does Aetrix verify that QS3VH257QG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH257QG8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that QS3VH257QG8 meets industry standards.
7.What is the process for return or replacement of QS3VH257QG8?
All QS3VH257QG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH257QG8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The QS3VH257QG8 part is unused and in its original packaging.
Return procedure for QS3VH257QG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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